How can I sum across rows that have equal values in the first column of a numpy array? For example:
In: np.array([[1,2,3],
[1,4,6],
[2,3,5],
[2,6,2],
[3,4,8]])
Out: [[1,6,9], [2,9,7], [3,4,8]]
Any help would be greatly appreciated.
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